I watched a National Geographic show about the sun a couple weeks ago, and they implied that the sun goes through phases every 10-15 years. And right now we're heading into a phase where the sun isn't as active anymore.
According to them, when the Vikings(IIRC)....originally settled in Greeceland, everything was green, and a few years later, due only to a decrease in the activity of the sun, everything was frozen and most of the people died off.
I haven't actually researched that to find out if its actually true, but usually National Geographic doesn't lie about stuff like that.
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